MPA Electrical B4221 Power Brake Booster

Overview

MPA Electrical B4221 is a remanufactured vacuum power brake booster built for direct brake assist replacement in select Nissan and Chevrolet applications. It is engineered to deliver strong vacuum-assisted braking with reduced pedal effort, and it is tested at the end of production for consistent output.

Key Features

• Remanufactured vacuum brake booster for standard replacement service
• Metal housing for durable brake system support
• 8x1.25 master cylinder stud thread size
• Master cylinder, gasket, seal, and mounting bracket are not included
• End-of-line tested for pressure transfer and vacuum seal performance

Detailed Description

MPA Electrical B4221 is a vacuum power brake booster intended for brake system restoration where the original booster no longer maintains proper assist or vacuum integrity. The remanufactured construction uses replacement and specially treated components to help maintain a reliable vacuum seal and consistent pressure transfer. This part cross-references Monroe Shocks & Struts (e.g., 47210-3LM0A) for the same application. It fits 2013-2021 Nissan NV200, N/A and 2015-2018 Chevrolet City Express, N/A. For buyers searching for a Nissan NV200 brake booster or Chevrolet City Express power brake booster, B4221 provides a direct replacement path for the original vacuum-assisted unit.

What It Helps Solve

• Hard brake pedal feel caused by booster wear
• Reduced braking assist from vacuum seal loss
• Inconsistent pedal response during braking
• Replacement needs after booster housing or internal component deterioration

Installation Notes

Verify master cylinder stud thread size before installation. This booster does not include the master cylinder, gasket, seal, or mounting bracket, so reuse or source those components separately as needed. Confirm fitment against the vehicle application and brake system configuration before installation on Nissan NV200 or Chevrolet City Express models.

Quality Assurance

MPA Electrical subjects each unit to 100% end-of-line testing using proprietary equipment to verify braking assist performance, vacuum sealing, and pressure transfer consistency.